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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d2a3fe4acfa9e6903474a35403691dcfb5a4d505e9c4fd39aafcca0de423601' 
  AND token = 'Vny/sQFFsGLhRzdAg1ShhHtr1ksNbZNFP9tAiYyOuVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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