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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '433020dcdda218da252be4da239c8b67d64c7dcd944bac3118f163ed430fd7c6' 
  AND token = 'ixAV41ZnZnQ9dZ9dauGKBiDuY6P0YUsaBAcqqyrPR+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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