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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8acb011c533b6f40fffc3b43abe61e33ee9e77d063282f25fa5c710100da9d22' 
  AND token = '6hMQW1ZNPtCu3v48fdBGul2xSS5hAcJiA13hfq+g6Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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