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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd394217f256b5d800b1d2ca1f914c5cf37bd8cd208e5276e1730b368e41d94b2' 
  AND token = '+idPeyYwdpb9dXPIN9GxwuvauJgxjtR0/QE7g89Vhdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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