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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26014be62a17ef79690ccb930b0373b195fb7248c84bc5ac4ff2ab7446b762ef' 
  AND token = 'psDj2sJ903NpFda5HnXDhFkmaz/bE7N2+Si4XLMwB/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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