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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce772ecd8adebfe4ea5d9b29ff667b3277290311ffe962f3d00e81ba2eb42e89' 
  AND token = 'wFk0/a4udnyzkolZ8B9Gj5mMzHUdiz5XtA7QF35/qYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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