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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e8cfc20d28fea5f6c25eab49d20e495a339945a7b16ec759893cdca4e879199' 
  AND token = 'ijOm2tZMpm8oDPgSDirQXR1A9Zm3AEAUJK2rrC2/uu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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