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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b2eb4e38cc14e63929edc0bd96042a5be3afd4733cdc18967a9d4a922c610b' 
  AND token = 'En6vWRPDUNHSLfLIK1LLm+bH2aC311q8ZlwW2zLcMlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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