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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08222c651ce500ecbaf0325f636b7955605bc62605c8b5675163647cbdc6ab66' 
  AND token = 'TV6kEqpwNBjv5EZ/qyIfOUX6KSpK+ZaZeBVRq5E/+FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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