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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cfad9b6aed60389f2efce8dba0d77eed1e71bd8e4ef9165173581b59f0b3f87' 
  AND token = 'noZ88ESxbbqD6k9rSrVNExWpoU0iCEXwsXLD/f+F7SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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