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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ba2e55e2b03588d5a6c32da60f03e2739643a4579eb1a1ea60d0fbbca69085' 
  AND token = 'wDhj0B3BAKNBJss7ZxmbXW7egqYhOkQ97Od8fnmrX80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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