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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec84ac492b949b284560cefe4cdc246d2b2cb54d0733c9527d7b9614589c570' 
  AND token = '6BG8b0ddwtWy4qk/XU98V2XoS7maV+KC5z88LyXU0jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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