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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d98e0c54c849c660eb2936f265de69353e7df29be270552d53f279774a2930' 
  AND token = 'FNssm/Zc3xp6pghMZwd09kjTEOb2jjjRCjwMt6vDP40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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