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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc167c54b3b420198f399191723d520fd9cb607f33d62b2506f17f94dfac888' 
  AND token = '2h5XSG2RBMKyqViOdg4JtIW+eNvA65fPu2uErTL9SuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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