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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0cfbe9357b6fa19cb9849e49daf87a216fc7750d86cc1de9fa78d52fcd219e4' 
  AND token = 'bHDdbMykO9Dku6E5FQYSKt5JUj/QT3STSK95XPI2Qsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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