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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc8842445f0d05eee21d2618ecd6ebc997a53ce8b932566bdfefd75e73fb76b' 
  AND token = 'GRoWYORLfC0iPTSO8HJFoOQ16oQ/kNZ9ukWBw+/xqRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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