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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a7309d3d60e151548f5d3ec9c29dc4a6b3cc5970a87bde6809eec6a60d4429' 
  AND token = 'hKekW6arSALIRWAi/rLUclcJdaM+/ejqR9mnxiDz3UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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