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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247fe23ebd75cdc63ac398446600543cf3d90e4adad0fca4f1c6e96f5cfb9ea4' 
  AND token = 'dAP7My+kKTtETttQW8w1VSgHBJ47B7ttRFjkaKsnXWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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