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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89194b53a63f3c79b58a5a162245c9eaede3ed81c450c5c98a585b60218ff29' 
  AND token = 'NDWl9PlVEVFn2tZ93ZtcwTJTL7+QY3lfy6uAOZ9tk5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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