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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc07ee268ff12fd7c320daefb608bc3b0d5870f117d60d721b6133c24077ee1' 
  AND token = '7guxXCDlIQy003N0xwe/Q5rC3rt1xdQ87Hz8aRzolmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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