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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94772255fd4181e4c1def8c4f818c874cba5bdfcc39873da22071abc2ef521c9' 
  AND token = 'd1QnDp1K6t/s7R0650eEwzTq82I4eRwsbA5wFJOA7WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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