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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4f10bca95da5a8aa83c6a005417e92d5523a0ee403cac16bd877cae482deae' 
  AND token = '8UyyDpt+sGbqpydfJ1ZMo6UvlsQ8uD9wppXVRpTmF2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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