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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc7591a1819bd3e1a142cee76e0565876c9c47e740d0ecb5ea6936cfd1bd1dc' 
  AND token = 'kyRaRglxrXYVNK2an3WtPHtahUe/2vDOdCYz7zObQzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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