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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c8ef8c1ddc953d29428756175bd02f89e7631db7a8c9fc5531328f4d248d53f' 
  AND token = 'r5NQo8QY6TtwrcxIy0GsluJTIYNTyHA3RUDdr5eEPKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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