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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba975e77c05c94038b3b43544d39e910b6be42045b56d6d329dda41da6f6b138' 
  AND token = 'bmxiQy+GHz/oom7Txti7ydDHC4BZEHyu6YnfazvzxdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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