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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860b176b72a90f5e706151b17ba7a806e06b33ae3a4bb8f0b3e43d57bc1371d2' 
  AND token = '8Xrh5bxRKACHXnK9Vonhl5Mwgq6JCcKnZgkGd2kv5wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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