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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e619ee71ab0a1a21329d2cb615784951336806a9ca92f303c75967a1cb24796f' 
  AND token = '9CYdaJrRnrkb3ABXrebHxQ+2fl3w5PBhdqes5VW4RQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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