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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d033da8fa18563a1e55e74564811ecbb416293154569c69859e0f092228193' 
  AND token = 'QBld6AvXMutrfc8hsieNN/37i4P9sE+7LC/s9mr/M4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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