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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bda5e7020d1f3ee8a42536459961905d5cfa39bf88d4d43afc5cec06a6e359a' 
  AND token = 'gja+ICBA8e0HycKZmjhCJ02xim77eYaTtsUSQarah7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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