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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '743819d7b605b699160bd5a7170d2758aa389d4e5780121c7cc7be7d487eb130' 
  AND token = 'V8xWdrQ1xGUhetpZkJjD4l5HGS6tQdd9JX0vgQwOenQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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