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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0983562a4bfb2a20be355656ee54135cb29ea472192879f8bd7ca5cb6a4984b' 
  AND token = 'eCKo1C9vuKn+o6VGcyuyF17B6ZpWPr8F9WrkwgkmvK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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