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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97245f5ebed0a1ce2b20e274a874a4d4e26a79b3583be2c2ad6cbf6a226948a4' 
  AND token = 'sPXG6cC5bd6uyb8rUmPkXTL6AXfbTdBo7AclEICqkxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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