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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd527605474c63a678816666baf8a8a7d561f0cc452ea1cb3bfb7ffa4151c6b5c' 
  AND token = 'd48oAiYy2KzOM5ixdSTgn7NvPBAEnoSdk6nITek5t3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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