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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df694b0a4fedd887474724a5133b5272ec35c59ab7757b92d7026d5f09c7f22c' 
  AND token = 'Yb1AYGjUGrjC0yLvFoRkEepDOYwCtia9NL0Ooh2LAnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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