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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daefff6b8bf08d5369c240e4a05efb83594788b4dcd9b652ac1fcb79578ca265' 
  AND token = 'jBheneEd8g21FAaJKA+sH73s+o02UTvEYq1xFaL5H54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}