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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd13dbf611d4dda42667e5fb6293d35e2c2b2386869ffb3f7bf1bf3b08b9069' 
  AND token = 'bIjMaVeyaTRj3Zp5dXEERACJuu/GnZ2wKQeQVwUNNoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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