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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4896fe5b3e5ac2abed30889a3e22a6fda07fb53f524eb0a24f0b14ba0db9dd' 
  AND token = 'rmUXFslZlkVAoPn3HReqMRzsPaYnTgzoPov07Nwsn8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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