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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8294f871b4b6ea3a8b99b889b7326dc3e5c10367a1ac22f619e671d382b8783' 
  AND token = 'Gk0LSIzwzuofddEpq7lxDl9BYwtwEE64LmyzBYllhoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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