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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c572daa0ba04d0760ed48608f8d9deabd1f2b4b8b37b8887cf58ff0621148cc' 
  AND token = '0kKOphEFv6lZhlm0WSQ0MnKwIbnSszfezFKIzTpyWSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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