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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b9c856ad721f5a9b9694fba8f1a53949b1eb67b112f12f7bea4700aee113fc' 
  AND token = 'vnBkAiVbzOhdVJ4Fjw6029nrN2KxqaxhLN7knP7a7UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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