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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7db89dac202cfdfffcff81471b086d7bd9d63a175048b9450b92ed3078e864' 
  AND token = '8eZ59cYK09r578bhAFFHErpsIDD26GzX8ekAC9vIF70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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