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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b078f45ddd8cbed66e6895f1054c6c829fd79b587ace9a84526302dcabea5b63' 
  AND token = '1RcpIMzvuz7Y6wp1mZTggVNVweJLHiMoZCsemXTaEtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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