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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd665bfccd77a109e77cf3e6bf9904454e2936e05f345db683deb2bb184c9aa7e' 
  AND token = 'o1usN6Jvyj6uDmC17DE04RvUba3rTCSTtqGzd6V0Qys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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