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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e1efbd21552a80e5c92c482fbe584312a8c105b56955e24e20a69a6f184566' 
  AND token = 'EnTUveYxtLWfO4k7KXFzzQSeCLdozpcI4FX98PF+j60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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