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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e98dab8946b44f228c54c5a474c5fd480b9105e773aa5a456850878d87ede64' 
  AND token = 'KaOkPCrx5nkKPR+pDigue3G213yfOg9Duer5JNlX+zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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