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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079eda29c63a667abbb2d882582f0388841c411be3f61e9328eed78e325b472f' 
  AND token = 'fHfqnXiCy67mQsNI2+FENRU2NC0Bw3VIzq8pLzOaHiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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