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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3336c00be4908de9835eedcca01dbd63502357bf57118c7862121b4605443e94' 
  AND token = '/LO0ozcP3ns3wcaa50NTgXQKJrqW7t+kfzoArfUjljc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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