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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbdc6d9b9182b3b9beaa6a6a07237ca9a46c85c8c1f3a0f8465474c4ba984750' 
  AND token = 'mKLJOdwy2Ddwz6e/R8mXyaZOkMyYMm3+VHTwLzj7fpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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