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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f316c07956e72f24c2ee0340986062f3dc4c09fa5f1fe475c5259bced9b6dda' 
  AND token = 'uLkEKz7uYrZpfvMl3ee5DcqfBcnFAHHugDQL6Py1m6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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