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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee947ab68d6891514892f01364acb344953c07a1df4f734f86a69518e7f4cbf7' 
  AND token = '0kKJG4XKtbpu9YTgEmddMowTfZkH1hqC8f7Z1AY/EEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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