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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770de5b9405e66d1e5895254c3a0ee2fd324c1378429668ea8ad612dfa0cc9ba' 
  AND token = 'wGwmXWe75uz/wjYG5BdPuNlzCTZEFz4n5BWNxNpYC6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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