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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8609af2c34331fbce326cc3d615126155d95006a85abc0ca7074cb4f5f201498' 
  AND token = 'GIf0tcxomgQ97kgV8/e/9Kj/q0C25Vg5X//EabWiEl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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